You'll be able to do it, but it won't be stable, because the straps will only be 18" or so apart. You might be tempted to crank the straps down a bit more to compensate, and pop your roof panel down (it'll pop back up again, probably without any damage)

Not ideal, I'd get a proper roof rack, especially for heavier, things with more shap in teh wid, like a kayak.

You'll be able to fnid one to fit, and you might not have to spend much more if any more than a soft rack.

Edit: just clicked the link. fiar enough. Still can't see the advantage over a roof rack, though. Mine was the same price as that soft one.

I bought it as it was cheaper than paying for delivery of a load of flat-packed furniture. Fitted, then discovered the boxes all fitted in the car so I've never used it. Got proper roof bars now so I'm never going to need it.